Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15a925df51f236b…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 07:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 25d056f8db4733a822991f74ce9eb619 SHA-1: 0c4828f7cde0f69ef4ab043fe583f3fd5a3aa0da SHA-256: d15a925df51f236b0cc349592157c209b81f1c4d18d3d437915aa4345da5ac1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=schwinn+airdyne+ad6+replacement+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5ff1c540969e9.pdfIn PDF document text
    • http://shtangye.xyz/gemurupotolitiwekuzakufijymg8m.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/city_of_ashes_movie_201915y24.pdfIn PDF document text
    • http://sushibara.net/friedberg_linear_algebra_5th_editiont7hb3.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/dLidbjb/stupid_zombies_2_snow_day_28.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/fOghhg6/stack_buffer_overflow_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_6016781e82a77.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/latest_telegram_freexuupw.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/jgvTozR/atos_vr_hang_glider.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/j4vUoif/might_magic_era_of_chaos_mod_apk.pdfIn PDF document text
    • http://fumigatoff.online/how_to_connect_swann_security_camera5ceqf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408851/normal_5fdf2adeb3882.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/divina_commedia_italianodw35p.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/dqrrthi/800_words_season_3_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/409c083a-99b0-4503-b185-6330e242b152/what_food_has_under_10_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bc0aff-d94e-4327-bcfe-a3377c2ee811/what_does_the_bible_say_about_virtual_reality.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/66380749352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54019494-a6cb-4497-9639-9bea3a1768c0/time_management_tips_for_busy_professionals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69eda9f-d0c6-4a84-a848-ec2fec22acf7/crochet_pattern_for_unicorn_hat_and_scarf.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/warcraft_3_reign_of_chaos_patch_1.27.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/32048739521.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5440 bytes
SHA-256: 9b5e94928722a12f75f89b113b7ad3cbdb45ed0d9661949080576f0532b9734f
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 11056 bytes
SHA-256: 041f67a2e0accb0feffa249c8ce57e8bd4594e1843b0aedbf8377463ade8281b
font_02_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34